IF and I said IF the trends regarding deaths and vaccines keep falling at their current rate, I suspect the noises will be quite loud for a full reopening by the end of March.
They'll gather in volume but I think there'll be reasonable doubt in most minds - still too early - but by mid April/early May if numbers are as low as I expect them to be then it'll be increasingly impossible to prevent people just completely disregarding advice.
If they're smart, they bring the total re-opening forward to around 15 May and say they're doing so on the proviso that people still take precautions like masks. Because by doing that people would do that. If they waited til mid-June, as soon as that deadline hit everyone would take the proverbial urine and completely stop any voluntary safety measures.